RPG Theory Glossary: H

(1) In general, this means players who are especially dedicated to
anything. Thus, hard-core medieval LARP players might sew their
own clothes, while hard-core storytelling players might study
narrative theory for years. (2) A coin termed by Ron Edwards in
his Gamism essay for Gamist play with minimal or even absent
Exploration.
References:
Gamism: Step On Up